How to Change the Oil in a 2011 GAS GAS EC 300

Shop parts for a 2011 GAS GAS EC 300 Dirt Bike.

Changing the transmission oil in your 2011 GAS GAS EC 300 is a crucial maintenance step to keep your bike running smoothly and extend the life of your clutch and gears. This guide, proprietary to MotoSport.com, will walk you step-by-step through the process. It includes the tools you'll need, special call-outs specific to this model, and best practices to ensure a clean, efficient oil change.

Tools & Materials Needed

  • 6mm Allen wrench (preferably a socket type for more leverage)
  • Drain pan for waste oil
  • Measuring cup or oil jug with accurate markings
  • Fresh transmission oil (900cc/0.95 US quart–use a high-quality gear oil recommended for 2-stroke motorcycle transmissions)
  • Rags or paper towels for cleaning
  • Optional: Brake cleaner for cleaning the drain plug
  • Torque wrench (if available, to reinstall the drain bolt to spec)
  • Skid plate tools (if your bike has an aftermarket or OEM skid plate installed)
  • Oil funnel or squeeze bottle with a small spout
  • Gloves to keep hands clean

Special Model-Specific Notes for the 2011 GAS GAS EC 300

  • This model is a two-stroke, so there is no oil filter to change–just transmission/clutch oil.
  • Oil capacity is 900cc. Do not overfill, as this may cause clutch drag or oil leaks.
  • The fill plug opening is small and awkwardly positioned; laying the bike over helps with filling.
  • You may need to remove the skid plate to access the drain plug. Some aftermarket guards have a hole aligned for easy access; others do not and must be removed.
  • The OEM drain plug is magnetic. Clean it thoroughly and inspect for metal shavings–some fine debris is normal from clutch wear.
  • Do not overtighten the drain plug, as the case is aluminum and threads can strip more easily.

Step-by-Step Oil Change Procedure

  • Warm Up the Engine
    • Lightly warm the engine for a couple of minutes. This thins the oil, helping it drain more completely. Turn off the bike and let it cool enough to work safely.
  • Remove Skid Plate (If Needed)
    • If your EC 300 has any kind of skid plate blocking the bottom of the engine, use the appropriate tool (usually a 4mm or 5mm Allen) to remove it. Some plates have a drain hole–if yours does, you can keep the plate on.
  • Position the Bike and Oil Pan
    • Place the bike upright on its stand or lean it slightly if needed for access. Put the drain pan directly below the drain plug.
  • Remove the Drain Plug
    • Using your 6mm Allen wrench, carefully loosen and remove the drain plug located at the bottom of the crankcase. (Watch for hot oil if the engine is warm.) Let the oil completely drain.
    • Inspect the magnetic plug for any metal shavings. Wipe it clean and inspect for any excessive debris that might indicate transmission or clutch wear. Use brake cleaner if needed.
  • Reinstall the Drain Plug
    • Once oil has drained, replace the drain plug–make sure it threads easily and is not cross-threaded. Tighten snugly but do not overtighten. If you have a torque wrench, follow the manual spec (typically 12–14 Nm for most Gas Gas models; confirm in your manual).
  • Remove the Fill Plug
    • The fill plug is on the right side of the engine case. Remove it using the correct size wrench or socket. The fill hole is small and positioned awkwardly, so an oil funnel or squeeze bottle with a fine tip makes it easier to add new oil.
      Some owners find it handy to carefully tilt the bike on its side (clutch cover facing up) to make filling easier and reduce spills.
  • Add New Transmission Oil
    • Measure out exactly 900cc of fresh oil.
    • Slowly add the oil into the fill hole. Take your time as the fill port is small. Pause if the oil backs up in the hole, letting it settle.
    • Reinstall the fill plug. Be careful not to overtighten, as the threads are soft aluminum.
  • Check for Leaks and Wipe Down
    • Inspect the bottom of the engine and plug for any leaks. Wipe away any spilled oil.
    • If you removed the skid plate, reinstall it securely.
  • Run the Engine and Final Check
    • Start the bike and let it run for about a minute. Shut it off and look for any signs of leaks around the drain and fill plugs.
    • Check the oil sight glass (if equipped) or use the level check bolt per your owner's manual. Add a small amount of oil if needed, but do not overfill.
  • Proper Oil Disposal
    • Dispose of used oil at a local recycling center or auto parts store.

Special Tips for the 2011 GAS GAS EC 300

  • Always double check the oil volume. Running too much or too little oil can cause clutch issues or wear.
    This bike requires 900cc of oil–do not deviate from this amount unless you have an aftermarket clutch or case.
    'the gas gas is it only holds 900 CC of oil but the fill plug is right here... the bottom plug is well on the bottom it's pretty easy get to...it's just for the clutch and transmission... it's just an aluminum plug so you want to make sure your alum fits really good in there...and being a two-stroke we don't have to worry about an oil filter...'
  • Clean the magnetic drain plug thoroughly every oil change to monitor internal wear.
  • The fill hole is very small; patience is key to avoid spills. A squeeze bottle or narrow funnel will make things cleaner and easier.
    'my only really complain about it is the fill hole is ridiculously small and you gotta lay the bike over really to do it'
  • No oil filter to change–this simplifies maintenance.
  • Always inspect drained oil for discoloration or particles, which may indicate internal engine or clutch wear.
  • Tighten all bolts by hand first before torquing down with a wrench to avoid damaging soft aluminum threads.

Conclusion

Changing the oil on a 2011 GAS GAS EC 300 is straightforward once you know the idiosyncrasies of the fill and drain locations. Keep your tools ready, use the specified oil, and double-check the amount each time. Proper maintenance will keep your EC 300's transmission and clutch operating smoothly for years to come. For high-quality oils, tools, or replacement parts, trust MotoSport.com to keep you on track and on the trail.

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Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your motorcycle's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.